Beating-engine for rags



(No Model.)

P. DILLON. BEATING ENGINE PoR Mes, en.

No. 524,497. W Patented Aug, 14, 1894.

' UNITED STrfrnsl PATENT OFFICE.

PETER DILLON, OF LAWRENCE, MASSACHUSETTS.

BEATINGA-ENGINE FOR RAGS, 86C.

SEGIFICATION forming part of Letters Patent No. 524,497, dated August14, 1894.

lApplication filed May 22, 1893. Serial No. 475,042. (No model.)

To all whom it may concern:

Be it known that I, PETER DILLoN, of Law` rence, county of Essex, Stateof Massachusetts, have invented an Improvement in Beat` ing-Engines forRags, te., ol which the following description, in connection with theaccompanying drawings, is a specication, like `which the pulp-stock maytravel, the beater discharging theliquid pulp over what is called a backfall, so that the circulation of the liquid is insured, the mid-boardextending in practice beyond the back fall so as to reform the currentof pulp stock after passing the back `fall and before turning about themidboard. It is a great desideratum to thoroughly and uniformly grindthe rags or fiber and mix the same, and my present improvements havebeen devised for that purpose. In the use of the ordinary beatingengine, the liquid and fiber or stock which is next the inner side wallof the mid-board when passing under the cylinder, hugs the said innerside throughout its travel around and around in the raceway. I have byexperiments devised means whereby the stock is shifted or made to changeits position from side to side at the end of the tank where the backfall is located.

In accordance with my invention I have reduced the length of the backfall, thus making it more abrupt, and I have cut away or omitted themid-board beyond the back fall and so shaped the rear side of the backfall by under-cutting the same or removing a portion of it at its end inthe line of the midboard, and between the bottom of the tank and the topof the back-fall, as to enable the pulp-stockrunnin g over the back fallnearest the inner wall of the tank to take a quick sharp tu rn from thetank wall toward the line of the mid-board and at the foot of the backfall, it turning sharply about the back fall in the line of themid-board and getting under the pulp-stock then being discharged overthe back fall near the line of the mid-board. To do this in the simplestform, I have, in this instance of my invention provided the top of theback fall, commencing at or near the mid-board, with an apron which isextended across and projects beyond the back fall for about half, moreor less, of its width, and I have elevated orinclined upwardly thebottom of the tank at the rear of the back fall, from at or about theline of the mid- Jooard to the side wall of the tank, and have concavedsaid bottom and out under the rear side of the back fall from near theside wall of the tank to the junction of the mid-board and back fall,andso lowered the bottom of the tank near the junction of the back fall andmid-board as to form a passage-way along which the pulp-stock may travelquickly and easily. In other words, I have provided the back fall with alip or apron of such shape, taken in connection with the cut under rearside of the back fall and the raceway bottom that the body or sheet ofliquid stock will be given a twist or will be overturned as it passesover the back fall.

Figure 1 is a top view of a beating engine embodying my invention, withthe cylinder cover partially broken away. Fig. 2 is a ver ticalsectional view in the line Fig. l. Fig. 3 is a transverse sectional viewtaken in the line ',Fig. 2, parts beyond the roll being omitted. Fig. 4is a detached view of one of the plates to be connected to the mid-boardand side wall; and Fig. 5 is asectional detail to be referred to, takenon the line 002, Fig. l.

The tank A,t11e bed-plate C, the roll or beater D, and cover F are andmay be all as usual.

The ordinary form of beater engine has a mid-board and a back fall, butin this myinvention the mid-board and back fall have been altered inconstruction, I have shortened the back fall E, cut most of it away inthe direction of the length of the tank and have made its rear side moreabrupt, as shown in Fig. 3, and I have shortened the mid-board B so thatits end no longer extends beyond the back fall. I have so shaped theback fall by cutting under its rear side below its top andl between theside wall'and the mid-board as to present a lip or apron a, it beingextended from at or near the line of the mid-board to- ICO ward the sideof the tank along the top of and for about half the length of the backfall more or less. I have also changed the shape of the bottom of thetank at the rear of the back fall so that the tank bottom is madeconcave, and is contracted, and the said bottom is also concave in thedotted line m2, Fig. l, being lowest near the junction of the midboardand the back fall, so that the pulp liquid coming along at the side ofthe tank as designated by arrows 1, and discharged over that part of theback fall where there is no lip or apron, will, by reason of thecurvature of the bottom of the tank at the rear of the back fall, andthe under cutting of the back.

fall, turn sharply about the junction of the back fall and mid-board andfollow along the side of the mid-board;

The liquid pulp stock discharged over the part of the back fall havingthe apron will be made to cross over the top of the liquid pulp stockdesignated by arrows l discharged over the unaproned part of the backfall,and will follow along the inner side of the Wall of the tank, asdesignated by arrows 2.

From the foregoing, it will be understood that the liquid dischargedover the inner end of the back fall will be returned to the back fall inposition to be passed over the outer end or portion of the back fall,and vice-versa, and in this way, the liquid is, as I may say, overturnedormade to change from outer to inner side of raceway, thus thoroughlymixing the liquid audits contents and subjecting all parts of the stockto equal beating.

Sometimes with usual beaters, the stock becomes jammed in between theend of the beater and the wall of the tank, or the end of the beater andthe mid-board. To overcome this I have provided the beater at its endswith an annular projection, preferably inthe form of a metallic ring b,see Figs. l and 3, having a groove b into which is entered the concaveedges 3, of metallic plates c, c', attached to the side wall of the tankand to the mid-board, respectively, and also to the inner sides of thecover, one of said plates being shown detachedin Fig. 4.

The side walls of the tank, and the midboard are each notched as is thecover, to re- 5 pulp discharged over the outer end of the back fall topass under the pulp being discharged over the back Wall near'themidboard.

j Having described my invention, what I claim as new, and desire tosecure by Letters Patent, is

l. In a beater engine, the combination, witha tank having a back fallcut under at its rear side gradually from near the side to themid-board; a mid-board; and a beater, of an apron at the top of andprojecting above the cut under portion of the back fall, to operate,substantially as described.

2. The combination with a tank and midboard, of a back-fall cut under atits rear side adjacent to the mid-board, to cause the materialdischarged over it near the line ot the mid-board to cross over thematerial discharged over the end of the back-fall nearest the sidewallot' the tank, the latter portion of the material passing along said cutunder portion, substantially as described.

3. The beater having one or more grooved hubs or projections, and thetank and partition, combined with plates engaging the grooves of saidhubs, to operate, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

PETER DILLoN. y

Witnesses: Y

GEO. W. GREGORY, M. J. SHERIDAN.

